I have created one app called Connective, kind of the same. People can create and join events near
PlayStore: https://play.google.com/store/apps/details?id=com.connectify... AppStore: https://apps.apple.com/us/app/connectiveapp/id6624294792
Maybe is not the best, and I'm still working to improve it and add new functionalities. The major problem now is we don't have much users, so there is few content.
Feel free to use it and if you have any questions, please let me know